1. Division of Medical Biochemistry, Tohoku Medical Pharmaceutical University, Sendai, Japan
2. Department of Medical Biochemistry, Tohoku University Graduate School of Medicine, Sendai, Japan
3. Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, Michigan, USA
4. Division of Pathology, Tohoku Medical Pharmaceutical University, Sendai, Japan
5. Department of Molecular Hematology, Tohoku University Graduate School of Medicine, Sendai, Japan